From nobody Sat Sep 13 01:48:47 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AA401C61DA4 for ; Mon, 6 Feb 2023 14:27:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231357AbjBFO1Y (ORCPT ); Mon, 6 Feb 2023 09:27:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45292 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231172AbjBFO1W (ORCPT ); Mon, 6 Feb 2023 09:27:22 -0500 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BD44C1448C for ; Mon, 6 Feb 2023 06:27:20 -0800 (PST) Received: by mail-yb1-xb4a.google.com with SMTP id y125-20020a25c883000000b0086349255277so9899969ybf.8 for ; Mon, 06 Feb 2023 06:27:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=4qqnrGkVhs9Vc4bivD45fxgO+no6959irDZQgiBvynQ=; b=aU5LgoD87HNQDMM6kdWC+HI88B2eqXW/hyZ40asuoB9u29j3Jt4jLJqwCGxAipiUgO /E+u/yRG9sLqgS8qo4/KoH9OKz72x7llBOGEl7vOShmStMlvDam6BroGlvwWqwMlTjip ILKvVLw6fbzHJW5OFg3/ympPbW/5edttt7TZ9GBq8GvbZgsZAOrKHK8Cch76lpiHn7cx 6CNBybLegfgEo4gSsDMJzDhVmqv2CXahZblflhWTSVS8NbZnP5g7n1hlM49a0p2w9SDs 25tSeY8A3gnrIOUGukXG6giph4Ze8b7aMt1NZKib4z3ikv8AveOgNMeMkOFLsxWRE90P BoCA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=4qqnrGkVhs9Vc4bivD45fxgO+no6959irDZQgiBvynQ=; b=H1s4EUz4eWZO6XAILTqFGgushzNjxn7VxIhpDmRwNOsIxN447lyXiVJpBOUAHEKF8Y m18vQUelWkdMzPSLbpMbqPi2aKuSourmsM1nrjcPN7YW8qVDv9j5Mm5ZUiQaFejQCPSi 59MVljFLo9s9PvEtSJjpBaP0H2EPxizbJF/bjXQkL3XY/OcuneLVsHWC9ep2WBAWrNgw Qg9EREMM6NR5/xyfBlp7KnEMn1C6NUU7cCKHERYkRTPHCHrRrTmUGNumYWjsaPdeRdeF 5NOrkJvaVXkFixRsO8dnWIEeDqshTexvgUnt3MeMufKl57laF2vCzNToyCcIFp+R3q1R BjVQ== X-Gm-Message-State: AO0yUKXtjTNggADnhagG9OfcXoByM7j/IjW3UWF7Jt2598A+6NqMKuxu 0F3n0MJYUzv1DN1DH5Gh0pcbkJCzbBxthLE= X-Google-Smtp-Source: AK7set+zEVPM0p7yMnswQPtt3wYKg8y3aDA7rz/3kbSqsy9NgvFzYi6BgDZwRaNbyiV49huUxWExWR1QvRWe7QU= X-Received: from liumartin.ntc.corp.google.com ([2401:fa00:fc:202:9373:4bd4:5bf3:5d5c]) (user=liumartin job=sendgmr) by 2002:a05:690c:38c:b0:524:ae14:59ac with SMTP id bh12-20020a05690c038c00b00524ae1459acmr16ywb.5.1675693639587; Mon, 06 Feb 2023 06:27:19 -0800 (PST) Date: Mon, 6 Feb 2023 22:27:14 +0800 Mime-Version: 1.0 X-Mailer: git-send-email 2.39.1.519.gcb327c4b5f-goog Message-ID: <20230206142714.4151047-1-liumartin@google.com> Subject: [PATCH] of: reserved-mem: expose reserved-mem details via debugfs From: Martin Liu To: robh+dt@kernel.org, frowand.list@gmail.com Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, surenb@google.com, minchan@kernel.org, tkjos@google.com, liumartin@google.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" It's important to know reserved-mem information in mobile world since reserved memory via device tree keeps increased in platform (e.g., 45% in our platform). Therefore, it's crucial to know the reserved memory sizes breakdown for the memory accounting. This patch shows the reserved memory breakdown under debugfs to make them visible. Below is an example output: cat $debugfs/reserved_mem/show 0x00000009fc400000..0x00000009ffffffff ( 61440 KB ) map reusable te= st1 0x00000009f9000000..0x00000009fc3fffff ( 53248 KB ) map reusable te= st2 0x00000000ffdf0000..0x00000000ffffffff ( 2112 KB ) map non-reusable te= st3 0x00000009f6000000..0x00000009f8ffffff ( 49152 KB ) map reusable te= st4 ... 0x00000000fd902000..0x00000000fd909fff ( 32 KB ) nomap non-reusable te= st38 0x00000000fd90a000..0x00000000fd90bfff ( 8 KB ) nomap non-reusable te= st39 Total 39 regions, 1446140 KB Signed-off-by: Martin Liu --- drivers/of/of_reserved_mem.c | 39 ++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c index 65f3b02a0e4e..a73228e07c8c 100644 --- a/drivers/of/of_reserved_mem.c +++ b/drivers/of/of_reserved_mem.c @@ -23,6 +23,7 @@ #include #include #include +#include =20 #include "of_private.h" =20 @@ -446,3 +447,41 @@ struct reserved_mem *of_reserved_mem_lookup(struct dev= ice_node *np) return NULL; } EXPORT_SYMBOL_GPL(of_reserved_mem_lookup); + +#if defined(CONFIG_DEBUG_FS) +static int of_reserved_mem_debug_show(struct seq_file *m, void *private) +{ + unsigned int i; + size_t sum =3D 0; + + for (i =3D 0; i < reserved_mem_count; i++) { + const struct reserved_mem *rmem =3D &reserved_mem[i]; + unsigned long node =3D rmem->fdt_node; + phys_addr_t end =3D rmem->base + rmem->size - 1; + bool nomap =3D (of_get_flat_dt_prop(node, "no-map", NULL)) !=3D NULL; + bool reusable =3D (of_get_flat_dt_prop(node, "reusable", NULL)) !=3D NUL= L; + + sum +=3D rmem->size; + seq_printf(m, "%pa..%pa ( %7lu KB ) %5s %12s %s\n", &rmem->base, + &end, rmem->size / 1024, + nomap ? "nomap" : "map", + reusable ? "reusable" : "non-reusable", + rmem->name ? rmem->name : "unknown"); + } + seq_printf(m, "Total %d regions, %zu KB\n", + reserved_mem_count, + sum / 1024); + return 0; +} +DEFINE_SHOW_ATTRIBUTE(of_reserved_mem_debug); + +static int __init of_reserved_mem_init_debugfs(void) +{ + struct dentry *root =3D debugfs_create_dir("reserved_mem", NULL); + + debugfs_create_file("show", 0444, root, + NULL, &of_reserved_mem_debug_fops); + return 0; +} +device_initcall(of_reserved_mem_init_debugfs); +#endif --=20 2.39.1.519.gcb327c4b5f-goog